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Old 09-05-2014, 02:04 PM   #29
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My vote is with Doug's analysis ... he even mentioned it way back in this thread.
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Old 09-05-2014, 04:15 PM   #30
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Quote:
Originally Posted by dkottum View Post
It has a light spring inside and flap that should keep (stinky) air from coming out of the plumbing line, especially when a slight vacuum is created inside the trailer such as using the fantastic fans with door and windows closed.
I have had two of these go bad - one in a wet bar in our home. The other was on a rental after the main sewer line backed up sewage into the valve.

I have seen these RV leak tests where a "smoke machine" is used to slightly pressurize the trailer with telltale smoke.

It seems like they could hook this machine up to the roof vent for the black and/or grey water tank, and slightly pressurize the drain/vent piping with the "smoke".
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Old 09-06-2014, 08:40 AM   #31
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Q1- smell takes 30 seconds or less from turning on one Fantastic Fan.
Q2- smell only occurs with affluent in tanks. When there empty there is no smell at all.


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Old 09-06-2014, 08:54 AM   #32
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Quote:
Originally Posted by clicker187 View Post
Q1- smell takes 30 seconds or less from turning on one Fantastic Fan.
Q2- smell only occurs with affluent in tanks. When there empty there is no smell at all.


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If they are empty now go pour some perfume down the toilet so that it only goes into the black tank. Turn on the fantastic fan and see if you smell perfume.

It you smell perfume coming from the closet, it's from the black tank plumbing system. If no smell the problem is most probably gray tank.

The black tank system includes the bathroom sink as well as the toilet in most models.
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Old 09-06-2014, 09:20 AM   #33
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Originally Posted by dkottum View Post

If they are empty now go pour some perfume down the toilet so that it only goes into the black tank. Turn on the fantastic fan and see if you smell perfume.

It you smell perfume coming from the closet, it's from the black tank plumbing system. If no smell the problem is most probably gray tank.

The black tank system includes the bathroom sink as well as the toilet in most models.
Genius!!!!

Nice sleuthing tip Doug!
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Old 09-06-2014, 09:30 AM   #34
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Yeah, I'm liking how this Doug guy thinks...
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Somebody ought to clean these windows. There is a tremendous buildup of gook all over them...
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Old 09-06-2014, 09:39 AM   #35
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You guys know if these tips don't work I'll look like an idiot.
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Old 09-06-2014, 09:49 AM   #36
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There is a difference

I think DK has the idea right. My question is the odor.....there is a definite difference between sewage, dead critters, mold, etc. Rancid has its own connotations to me as well. That ID, in itself, would help with sourcing.
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Old 09-06-2014, 09:53 AM   #37
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Had the same problem.

If everything is closed and I turn on the fantastic fan I get the sewer smell. I opened a window and turned on a fan... no smell. Just figured this is normal. So if I understand this thread I am looking at replacing a styrofoam gasket for the black water tank, a couple of spring valves in the gray water lines, and ensuring the toilet gasket is clear.
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Old 09-06-2014, 11:38 AM   #38
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You guys know if these tips don't work I'll look like an idiot.

...and we'll look like the idiots that jumped on your bandwagon...
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Old 09-07-2014, 07:32 AM   #39
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Ayrlett AAV's

We had the same problem with our 2014; a strong odor in the hall closet!

According to the 2013 FC parts manual you have the same AAV as our 2014; made by Ayrlett. Do a search on YouTube for "Ayrlett AAV for RVs." You will discover how the AAV operates and that it doesn't have a spring. The diaphragm should freely move when shaken. (A further search on the Ayrlett AAV patent will show there is no spring action involved; its gravity and air pressure operated.)


MY FIX: I first removed the AAV under the hall closet. I discovered when I initially shook the AAV that there was no clicking sound. The diaphragm was stuck. I therefore gave it a few taps on my knee to make sure the diaphragm (flapper valve) was free to move. It fixed the odor problem.

There are 3 air admittance valves in the trailer: 1) under the hall closet; 2) under the galley sink, and 3) under the lavatory sink.

A few trips after fixing the hall closet AAV I decided to check the other 2 AAV's. Their diaphragms weren't free to move! The one under the sink wouldn't even click after tapping it on my knee. I washed it in a weak soapy solution (I used Woolite) in a 5 gallon bucket. It now works. (I got the soapy solution idea from a tech when we were up at Jackson Center for some warranty work.)

I hope this helps your situation.
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Old 09-07-2014, 09:52 AM   #40
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Ayrlett AAV (2)

Ayrlett says to use Teflon tape on the threads.
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Old 09-07-2014, 07:54 PM   #41
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Clicker187,

Thanks for taking the time to post this thread. I had no idea the sewer smell with the fantastic fan on was abnormal. I have identified the 360 has two AAV's one at the kitchen sink, and one at the bathroom sink. I inspected both and found them to be oatey 39012 abs AAV's, but neither has anything but an open vent indicating it vents the black tank directly to the under sink areas. I am researching the replacement I want for our next trip, and look forward to many fantastic fan days without the smell.

Thanks!
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Old 03-06-2016, 10:29 PM   #42
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On my 2015 27fb I have the same strong sewer smell in the closet. (no smell under the closet) This happens when we travel down the hwy with sewer in the tanks. It is especially bad when the fantastic fans covers are open for cabin ventilation in hot weather. The dealer has looked at it twice and still have the problem.... may have to make the 1000 mile trek to Jackson Center. I don't think its from the grey tank... thinking it from the black tank. Next test is to drain just the grey tank and tow to check for smell. Any ideas? I am thinking that dznf0g may have a good idea.
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